Saturday's Celebration of Dance will include performances by Glee stars Harry Shum Jr. and Chord Overstreet, former and current contestants from So You Think You Can Dance and Dancing With the Stars and the cast of the movie Step Up Revolution. (While the highest price tix went for $400, general admission is as low as $35.)

If you remember, Holmes not only performed on So You Think You Can Dance in 2009, but last year she appeared as a guest judge.

Katie recently took Suri (on a commercial flight!) to visit with her family in Ohio, before returning to New York two days ago.